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Fast and Accurate Exhaled Breath Ammonia Measurement
Published on: June 11, 2014
Room-Temperature Ammonia Sensor Based on ZnO Nanorods Deposited on ST-Cut Quartz Surface Acoustic Wave Devices
Wei Li1, Yuanjun Guo2, Yongliang Tang3
1School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China. 201421040126@std.uestc.edu.cn.
Abstract:
Using a seed layer-free hydrothermal method, ZnO nanorods (NRs) were deposited on ST-cut quartz surface acoustic wave (SAW) devices for ammonia sensing at room temperature. For a comparison, a ZnO film layer with a thickness of 30 nm was also coated onto an ST-cut quartz SAW device using a sol-gel and spin-coating technique. The ammonia sensing results showed that the sensitivity, repeatability and stability of the ZnO NR-coated SAW device were superior to those of the ZnO film-coated SAW device due to the large surface-to-volume ratio of the ZnO NRs.
